| 摘要 |
<p>A system for controlling the engagement of a friction clutch (12) which is particularly suitable for controlling such a clutch in a tractor power take-off drive. The system includes two sensors (18, 19) which provide signals indicative of the input and output speeds of the clutch during the engagement process. These signals are compared in a microprocess control circuit (25) to produce comparison signals. Predetermined target accelerations for the clutch output (17) are set in relation to the full range of comparison signal values. The actual acceleration achieved by the clutch output is determined and the target and actual accelerations of the clutch output are compared and an error signal produced which is indicative of the disparity between the target and actual accelerations. Clutch engagement pressure is adjusted in response to the error signals so as to achieve the target accelerations using a solenoid operated valve (14) and the so-called pulse width modulation technique.</p> |
